Using boost theme
Download https://github.com/dmonllao/moodle-local_testanalytics/archive/abc03f0516bca563167eba80e6b884033b0eb118.zip extract in local/testanalytics and install the plugin
Suspend one of your site users, your site should also have a user that is not suspended (you probably have admin already)
Go to admin/tool/analytics/index.php and execute "Get predictions" action for "Undead users" model
Now you should see a dropdown menu in "Undead users" model
Select the suspended user from the dropdown, you SHOULD see "Undead" with a warning icon in "prediction" column; the cell color should be red
Return to admin/tool/analytics/index.php and select a user that is not suspended from the dropdown, you SHOULD see "Alive" with a check icon in "prediction" column; the cell color should be green
Switch to clean theme and verify that, even if the cells are not colored you can still see the warning icon for the suspended user and the check icon for the not suspended user

Description

This is a regression introduced by MDL-59265. Now mdl_analytics_predictions->prediction is a float so 0.0 is not an empty string anymore and binary::get_calculation_outcome, which has a if ($value) always returns OUTCOME_VERY_NEGATIVE.